Coal contains a surprising level of undesirable and toxic materials like mercury (Hg). While it is usually in trace amounts, the sheer volume of coal burned in the world exposes these dangerous materials to the human ecosystem.

To help make this easier to understand, let’s consider at 1,000,000 kilowatt hours of electricity — this is enough to power 80 average American homes for a year. The coal required to generate this much electricity contains a surprising half-ounce of mercury.

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Code: m108 kWhCoalHg